This is not walkable! And cabs don't stop here!
My suggestion - get a cab form where you're staying and ask them to wait for you while you take your picture.
PRO TIP - see that longggg line of people waiting to take a picture in front of the sign? Don't waste your time! Go to the side of the line and take your pic! If you have a talented photographer, they will position themselves so you (as the subject of the photo) will block the person (who waited in line) who is standing under the sign. Get it? Good. There's no time to waste in Vegas!!!